Finding the Fourth Proportional to 2,105.02, 2,904.69 and 1,220.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.02 : 2,904.69 = 1,220.50 : x
2. Step 2: Convert to fraction form
   2,105.02/2,904.69 = 1,220.50/x
3. Step 3: Cross multiply
   2,105.02x = 2,904.69 × 1,220.50
4. Step 4: Simplify right side
   2,105.02x = 3,545,174.15
5. Step 5: Solve for x
   x = 3,545,174.15/2,105.02
6. Step 6: Final answer
   x = 1,684.15